/******************************************************************************
 * SAGE - Scalable Adaptive Graphics Environment
 *
 * Module: sageLUV.cpp - LUV compression for pixel block
 * Author : Byungil Jeong
 *
 * Copyright (C) 2006 Electronic Visualization Laboratory,
 * University of Illinois at Chicago
 *
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the distribution.
 *  * Neither the name of the University of Illinois at Chicago nor
 *    the names of its contributors may be used to endorse or promote
 *    products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Direct questions, comments etc about SAGE to bijeong@evl.uic.edu or 
 * http://www.evl.uic.edu/cavern/forum/
 *
 *****************************************************************************/
#include "sageBase.h"
#include "sageLUV.h"

#if defined(__APPLE__) && defined(__MACH__)
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif

int RGBtoLUV(unsigned char *buffer, imageLUV *img)
{
   int i;
   unsigned char r,g,b;
   
   int bsize = img->width*img->height;
   img->component[0] = img->data;
   img->component[1] = &img->data[bsize*2];
   img->component[2] = &img->data[bsize*3];

   for (int i=0; i<bsize; i++) {
      r = buffer[i*3];
      g = buffer[i*3+1];
      b = buffer[i*3+2];

      img->component[0][i] = ((66 * r + 129 * g +  25 * b + 128) >> 8) + 16;
      img->component[1][i] = ((-38 * r - 74 * g + 112 * b + 128) >> 8) + 128;
      img->component[2][i] = ((112 * r - 94 * g -  18 * b + 128) >> 8) + 128;
   }

   int halfWidth = img->width/2;
   int halfHeight = img->height/2;
   int uvSize = halfWidth*halfHeight;
   unsigned char *pU = &img->data[bsize];
   unsigned char *pV = &img->data[bsize+uvSize];
   
   gluScaleImage(GL_RED, img->width, img->height, GL_UNSIGNED_BYTE, img->component[1], halfWidth,
      halfHeight, GL_UNSIGNED_BYTE, pU);
   gluScaleImage(GL_RED, img->width, img->height, GL_UNSIGNED_BYTE, img->component[2], halfWidth,
      halfHeight, GL_UNSIGNED_BYTE, pV);

   // If success, return the size in bytes
   return (bsize+2*uvSize);
}

int LUVtoRGB(unsigned char *buffer, imageLUV *img)
{
}
